A television or mobile device receiver for detecting and recovering payload data from a received signal, the television or mobile device receiver comprising:
- a radio frequency demodulation circuit configured to detect and recover the received signal, the received signal having been formed and transmitted by a transmitter to carry the payload data as Orthogonal Frequency Division Multiplexed (OFDM) symbols in one or more of a plurality of time divided frames, each frame including a preamble comprising a plurality of bootstrap OFDM symbols, a first of the bootstrap OFDM symbols having a first time domain structure and being configured so that the television or mobile device receiver can synchronize to a useful part of the bootstrap OFDM symbols and payload OFDM symbols, and one or more of other bootstrap OFDM symbols having at least a second time domain structure and carrying signaling data indicating parameters for detecting and recovering the payload data carried by the one or more of the plurality of time divided frames;
- a detector circuit configured to detect from one or more of the bootstrap OFDM symbols a synchronization timing for converting a temporal length of the useful part of the bootstrap OFDM symbols or the payload OFDM symbols into a frequency domain;
- a fast Fourier transformer configured to convert the temporal length of the useful part of the bootstrap OFDM symbols or the payload OFDM symbols from a time domain into the frequency domain in accordance with the detected synchronization timing;
- and
- a demodulator circuit configured to recover the signaling data from the bootstrap OFDM symbols using an estimate of a channel transfer function determined from the one or more of the bootstrap OFDM symbols, wherein the detector circuit includes:
- a first correlator adapted to the first time domain structure of the first bootstrap OFDM symbol and configured to auto-correlate the first bootstrap OFDM symbol in accordance with the first time domain structure to form a first correlation result;
- one or more second correlators adapted to the at least second time domain structure of the one or more of the other bootstrap OFDM symbols and configured to auto-correlate the one or more of the other bootstrap OFDM symbols in accordance with the at least second time domain structure to form at least one second correlation result;
- one or more delay circuitries configured to delay the first correlation result produced by the first correlator and the at least one second correlation result produced by the one or more second correlators so that the correlation results are produced contemporaneously for the first bootstrap OFDM symbol and the one or more of the other bootstrap OFDM symbols of the preamble;
- and
- a result combiner configured to form a combined correlation output by combining the delayed first and second correlation results produced by the first correlator and the one or more second correlators to generate a combined signal identifying the synchronization timing for converting the bootstrap or payload OFDM symbols from the time domain to the frequency domain.